Introduction to MATLAB { exercises and solution notes
https://www.cl.cam.ac.uk/.../1617/TeX+MATLAB/solutions/matlab-ans…Exercise 6: Use MATLAB to write an audio waveform (8 kHz sampling frequency) that contains a sequence of nine tones with frequencies 659, 622, 659, 622, 659, 494, 587, 523, and 440 Hz. Then add to this waveform a copy of itself in which every other sample has been multiplied by 1. Play the waveform, write it to a WAV le, and use the specgram